if the cast # is 3970010 check the date on the block if its 1968 its 327 and if its 1969 - 1979 its 350 and it could have come from anything, car, truck, maybe Vet. its a 2 bolt main, has a low power rating of 185 the highis 370

The only why to i.d your motor with out tearing it down, is with the stamped (Suffix ) Code on the right front (Passenger side) Of the block.Just below the head. The 3970010 casting numbers were used for 302/327/ and 350 blocks. With out looking up the suffix code your just guessing at it.Of course you could pull it down and have it mic`d.
Look up the number again at moretec or nastyz28 site and check it out. Please let us all know what you find. Feel free to e-mail me and i will help if i can.
Slider in Wa.

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